HOWTOs

Emergency lines:

• Maršík Petr 3411
• Šimek Jiří 3216

How to make a tunel to local server on diffent computer?

  ssh -N -f -M -S mysocket -L localhost:8000:localhost:8000 login@adress
  ssh -S mysocket -O exit login@adress

How to make your life easier?

  tmux
  Ctr-B D
  tmux attach

How to create an animated gif?

convert -delay 20 -loop 0 *.png  animation.gif

How to disable the sleep button on Ubuntu?

Find the number of the button (150 was for me):

  xmodmap -pk | grep -i sleep

Edit the file

 /usr/share/X11/xkb/keycodes/evdev 

and comment the line:

  //  = 150; // #define KEY_SLEEP    142

Other ways (dconf editor and command line gsetting set) didn't work for me :(.

How to install a local repository via pip ?

  $pip install -e .

How to iterate through pandas data frame?

the most efficient way to iterate through pandas dataframe

How to mount UI disks ?

  $sshfs petra@SOVAHOME.cs.cas.cz/[U_HOME,T_SHARE]/ MOUNTPOINT

And unmount?

  $ fusermount -u MOUNTPOINT

How to find tag creation date in git ?

  $ git log --tags --simplify-by-decoration --pretty="format:%ai %d"

How to label figures and tables in LaTeX?

• Alwayes first caption, label goes after the caption.
• If you put the label before the caption you will get a reference to the section.

How to run cProfile from command line?

  $ python -m cProfile -s cumtime myscript.py

How to change your default shell ?

Run:

  $ chsh 

How to submit a job into a que to be run after another task?

• run after another job successfully finished

       $ qsub -W depend=afterok:$JOBID job.sh
      

• run after another job finished

       $ qsub -W depend=afterany:$JOBID job.sh
      



• chaining more jobs

        #!/bin/bash
        last=$(qsub -v JOB_ID=1 job.pbs)
        echo $last
        for i in `seq 2 10`
        do 
         last=$(qsub -W depend=afterok:$last -v JOB_ID=$i job.pbs)
         echo $last
        done
      

How to comment/uncomment multiple lines with emacs?

• Emacs' commands: M-x comment-region, M-x uncomment-region
• Prefix every line with a character: C-x r t

How to define which GPU will be used?

• CUDA_VISIBLE_DEVICES To use it, set CUDA_VISIBLE_DEVICES to a comma-separated list of device IDs to make only those devices visible to the application. Note that you can use this technique both to mask out devices or to change the visibility order of devices so that the CUDA runtime enumerates them in a specific order.

  $ CUDA_VISIBLE_DEVICES=3 python test.py
  

• In code: (when using Keras)

   num_GPU = 1 
   config = tf.ConfigProto(allow_soft_placement=True,
                           device_count = {'GPU' : num_GPU})
   session = tf.Session(config=config)
   K.set_session(session)
  

How to join PDF files of different page sizes?

•  pdfjoin --paper a4paper --rotateoversize false file1.pdf file2.pdf file3.pdf 

How to compare two PDF files?

The goal was to compare two PhD thesis, the old version and the version year later, i.e. more than hunderd pages, different number of pages, the majority of text in common.

• https://www.diffchecker.com/pdf-diff - didn't work
• linux command:

   $ diffpdf old.pdf new.pdf 

  Didn't work. Matches corresponding pages only (i.e. page 1 with page 1, page 2 with page 2, ...)
• Converting to txt and comparing txt files.

  $ pdftotext -layout new.pdf new.txt 
  $ pdftotext -layout old.pdf old.txt
  $ diff -y -wB --color old.txt new.txt
  

How to compare two LaTeX sources?

• Greate tool:

  	$ latexdiff old.tex new.tex > diff.tex
   

• Also Online LaTeX diff tool

How to convert plain text to postscript?

 $ a2ps -RB -1 --borders=no -o output.ps input.txt

Don't forget to specify -o output.ps , otherwise the output is send DIRECTLY TO THE PRINTER!.

How to make links in PDF clickable and nice by LaTeX?

  \usepackage{hyperref}

  \hypersetup{
    colorlinks=true,
    linkcolor=blue,
    filecolor=blue,      
    urlcolor=blue}
  
  \urlstyle{same}

  ...

  \href{http://www.cs.cas.cz/petra}{My webpage}

How to include animated gif in pdf from LaTeX?

1. Convert animation.gif into sequence of jpgs:

         # convert animation.gif animation.jpg
         # ls
         animation.gif    animation-10.jpg  animation-6.jpg  animation-9.jpg
         animation-0.jpg  animation-4.jpg   animation-7.jpg
         animation-1.jpg  animation-5.jpg   animation-8.jpg
       

2. Use animate LaTeX package:

       ...
       \usepackage{animate}
       ...
       \animategraphics[loop,controls,width=9cm]{1}{animation-}{0}{9}
     

How to make Python programming convenient in Emacs?

Great overview is at Real Python's Emacs – The Best Python Editor? .

How to convert one encoding to another?

List available encodings:

  $ iconv -l 

Convert from WINDOWS-1250 to utf-8:

  $ iconv -f WINDOWS-1250 -t utf-8 input_file.txt > output_file.txt 

To detect encoding:

  $ file --mime-encoding myfile.txt

Conda

  $ conda create -n my_env_name python=3.7  # create environment
  $ conda activate my_env_name              # activate environment
  $ conda install scikit-learn              # conda install sklearn does not work!
  $ conda list -e > requirements.txt        # create list of installed packages
  $ conda env list                          # list available environments	

conda cheet sheet

Git: how to checkout a file from another branch

  $ git branch
  * my_actual_branch
    different_branch 
    master
  $ git checkout different_branch -- wanted_file.txt
  $ git commit -m "Update wanted_file.txt from different_branch"

How to travel through time?

No idea yet.